Roller-mill



ROLLER MILL.

No. 383,866 Patented Jan. '5, 1886.

I N VEN TOR (No Modei.) 3 Sheets-Sheet 2.

- I P. LAUHOFF.

' ROLLER MILL.

, No. 333,866. Patented Jan. 5. 1886.

WITNESSES %M15% (No Model.) 3 Sheets -Sheet 3.-

- P. LAUHOPF.

ROLLER MILL.

No. 333,866. PatentedJan. 5, 1836.

Attor UNITED STATES PATENT OFFICE.

FRANK LAUHOFF, OF DETROIT, MICHIGAN.

ROLLER- M ILL.

SPECIFICATIQN forming part of Letters Patent No. 333,866, dated January 5,1886. Application filed January 13, 1885. Serial No. 152,767. -(No model.)

To all whom it may concern: upon their edges adjacent to the rolls in such Be it known that I, FRANK LAUHOFF, of a manner that the feeding of the grain may Detroit, county of YVayne, and State of Michibe entirely closed off, if desired. 'gan, have invented certain new and userepresents pulleys upon the shafts of said ful'Improvements in Roller-Mills; and I derolls, and 0 one of the belts by which they clare the following to be a full, clear, and exare operated. act description of the same, such as will enable To hold the feedgates in any given position, others skilled in the art to which it pertains the crank ends of the shafts c 0 may be ena to make and use it, reference being had to the gaged in supporting-arms a upon the case,

10 accompanying drawings, which form a part of set-screws a being provided to bind upon the this specification. shafts and hold them in any desired place. My invention relates to roller-mills; and it This construction enables the operator to adconsists of the combinations of devices herejust the gates quickly whenever he may deem inafter specified,and more particularly pointed it necessary. I 5 out in the claims. D is a ridge-shaped way in the base of the 6 In thedrawings, Figure 1 is an end elevahopper to divide the grain, soas to feed it tion of my improved roller-mill. Fig. 2 is a from the same hopper upon the grinding-rollvertical section. Fig. 3 is a separate view of ers. I the eccentric and its connecting parts. Fig. E ismy improved grinding-bed located be- 20 4 is a separate view of the worm-gear. Fig. tween the grinding-rollers F and F. This 5 is an additional view illustrating the wormbed is concaved upon both sides, as shown in gear. Fig. 6 is a separate View of the indi- Fig. 2, so as to have a larger contact-surface cator connected therewith. Fig. 7 is a sepawit-h the rollers. rate view of one of the grinding-rollers. Fig. I prefer to construct the rollers and the bed 25 8 is a perspective view of the grindingbed. with furrowed corrugations, as shown in Fig. 9 is a vertical section of a feed-roll and Fig. 11, as this construction I find adapted feed-gate; Fig. 10, a separate inverted plan either for grinding or granulating grain.

view of the same. Fig. 11 illustrates the cor- I have described my invention as a grindrugations of the grinding-rollers and grinding-mill; but I would have it understood that 30 ing-bed. it is equally well adapted for granulating. 8o A represents any suitable case. The top of the bed is preferably made an- B is the hopper. gular, or with a double incline, as shown in G and 0 represent the feed-rollers suitably the drawings, its point projecting up between located at the throats b b of the hopper. These the ridge-shaped ways D, the construction be- 3 5 feed-rollers are constructed with a series of ing such that the grain is carried from either annular corrugations or teeth, as shown more side upon the adjacent grinding-rollers. particularly in Fig. 10. G and G represent brackets upon either 0 and 0 represent feedgates located in side of the case which'support the adjusting the throats of the hopper for adjusting the mechanisms for the grinding-rollers. 9 rep- 0 feed to the grinding-rolls. These gates are resents bearing-plates secured thereon. Hisa 0 adjusted upon crank-shafts c c, the crank ends worm provided with a handle or wheel, H, of said shafts extending to the exterior of the having its bearing in said plate. case, as shown in Fig. 1. Said shafts are con- I is a gear meshing with the worm, its shaft 1 structed with projecting arms or fingers 0*,en- I having its bearings in standards at the ends 5 gaging with suitable shoulders, 0 upon the of said plate. It will be observed that there gates, as shown in Fig. 9. It is thus obvious is a worm, H, wheel H, gear I, and shaft I that when said shafts are rotated said gates 'on each side of the machine. J is an eccentric, will be reciprocated to and from the feed-rollone of which is located upon said shafts I at ers, as may be desired to widen or narrow the each end.

5o throats. These feed-gates are also toothed K represents sliding boxes, in which the 1c grinding-roller shafts F arejournaled. k are eccentric-rods connected with said journals and with the eccentrics J by means of the bolts it, having located thereon springs K, said bolts being provided with thumb-nuts k by which they may be adjustably connected with the cases j of the eccentrics J.

It is evident that by turning the hand'wheels H the gears I are rotated and also the eccentrics upon the shafts I, by which means the grindingrollers may be adjusted relative to the grinding-bed, as may be desired. By this means the rollers may be adjusted uniformly and evenly upon the grinding-bed.

L are indicators mounted loosely on the fixed shafts Z, and L the fingers connected to said shafts.

hare the pinions upon the shafts of the wormgears H, meshing with said indicators, as shown in Figs. 2, 4, and 6. It is thus apparent that when shafts I are turned by the worm-gears to move the rollers to or from the concave bed the indicators L are simultaneously turned to the extent indicated by fingers L, and thus show the extent of adjustment of the rolls.

L is the driving-pulley; U, the pulley upon the shafts of the grinding-rollers F.

Z is the connecting-belt; Z, the belt-tightener.

The driving mechanism just alluded to is described and shown in the singular number; but it will be understood that the same may be duplicated at the other end of the machine.

M are cleaning-brushes provided with adjustable weights m upon arms M, which are extended upon the outside of the frame, said brushes being adapted to clean the pulverized flour from the rolls.

The arms 3' are pivoted to the case, as shown at m. By this construction the brushes are held evenly upon the rolls.

The case, as shown, is divided horizontally along the line of the brackets G G, so that access may readily be had to theinterior by lift ing off the upper part of the case.

I do not confine myself to the use of a single hopper through which to feed both grinding rolls, as by dividing the hopper, as shown, for instance, in dotted lines in Fig. 2, two different kinds of grain may be fed to and ground by the rollers upon the interior bed. Thus both hard and soft grain may be fed simultaneously.

The dividing-wall indicated in dotted lines may be made removable, so that either the same or different grains may be fed to the rolls, as desired.

The delivery-spout A may be similarly divided, if desired.

By providing each eccentricrod with a spring, should any foreign material get between the roll and the bed, the roller is permitted to give, and when the material has passed through the roller will immediately spring back to its proper place. Thus any breakage is prevented.

I provide the hopper with the auxiliary walls to the casein connection with one of the crankshafts c c,.provided with an indicator-finger so arranged that said gates may be adjusted accurately to any desired position, the same being shown upon the indicator. This indicator 'may be marked to correspond with the indicator L, so that in grinding a particular kind of grain the finger of the crank-shaft may be set upon the indicator to correspond with the adjusted location of the finger L upon the indicator L, if desired.

The grinding-bed E may be secured in the case in any suitable manner. The same may be provided with attaching-flanges e, for instance.

I prefer to provide the grinding-bed and grinding-rollers with longitudinal corrugations, as shown in Figs. 7 and 8, said corrugations being constructed in the shape shown in Fig. 11, in which the teeth of the roller are constructed with a convex grinding-face. The teeth of the bed are also convexed. Each tooth of the roller is constructed with an outer convex face, as shown in Fig. 11 at f.

Each tooth of the bed is constructed with a convex face, e.

The faeesf and e constitute the crushing or grinding faces upon the roller and bed, respectively.

Instead of cutting the grain, the grindingfaees of the teeth roll the grain, and in this way clean middlings are obtained.

The construction and arrangement here shown and described provide a very satisfactory grindingmill.

I have described certain parts in the plural; but it is obvious that they may be used in the singular, and where such is the case the said parts are embraced within my invention.

Vhat I claim is 1. In a roller-mill, the combination, with grinding-rollers, of an intermediate stationary grinding-bed separating said rollers and having concaved faces upon which said rollers grind, rotatable shafts eecentrically connected with said rollers, and worm gears to operate said shafts and adjust said rollers upon their concaved grinding-bed, substantially as described.

2. In a roller-mill, the combination, with grinding-rollers, of an intermediate stationary grinding bed having concaved faces upon which said rollers grind, said bed separating said rollers and the grain ground therebyupon its opposite concaved faces, rotatable shafts eecentrically connected with said rollers, worm-gears to operate said shafts and adjust said rollers upon said grinding-bed, and indicators connected with said gears, substantially as described.

3; The combination, with the adjustable grinding rollers F F and the intermediate stationary bed, E, separating said rollers and having concave faces, of the hopper B, having ridge-shaped way D, throats b b, and auxiliary inner walls, 1) b the feed-rollers G C, and adj ustable gates (3 0 substantially as described.

4. The combination,with the hopper B,having throats b b, the feed-rollers O 0, adjustable grinding-rollers F F, and intermediate stationary bed, E, of the adjustable gates (3 C the crank-shafts c a, mounted beneath said gates in engagement therewith and provided with indicating-fingers, and the indicators N, attached to the end of the hopper, substantially as described.

Witnesses:

N. S. WRIGHT, M. B. ODOGHERTY. 

